User:Hashar/bug31442

https://bugzilla.wikimedia.org/show_bug.cgi?id=31442


 * 1) $$\dot \vec B$$ not rendering
 * 2) $$\dot {\vec B}$$ proper rendering
 * 3) $$\dot \vec B = X$$ not rendering
 * 4) $$\dot \vec B = \text{X}$$ improper rendering
 * 5) $$\dot \vec B = \mathrm X$$ improper rendering
 * 6) $$\tilde\mathcal f$$
 * 7) $$\dot \vec B$$